--- OLD/xc/include/Xosdefs.h	Thu Jan  1 00:00:00 1970
+++ NEW/xc/include/Xosdefs.h	Thu Jan  1 00:00:00 1970
@@ -51,7 +51,7 @@
 #endif
 
 #ifdef vax
-#ifndef ultrix			/* assume vanilla BSD */
+#if !defined(ultrix) && !defined(__NetBSD__)
 #define X_NOT_POSIX
 #define X_NOT_STDC_ENV
 #endif